Method and apparatus for quenching lithopone



uw NNY. .Nw 0% l A. s. KREBs yMETHOD AND APPARATUS'FOR QUENCHING LITHOPONE Filed June 29, 192s May 31, 1921'.

- Patented May 3 1, 1927.

AUburln) A STATES PATENT'IoF-Flc. i

AUGUST soN'NIN xnEBs, or WILMINGTON, DELAWARE, AssIGNoE To TIIExnEBs rIG- MENT & CHEMICAL COMPANY, F DELAWARE.

NEWPORT, DELAWARE, A' CORPORATION orA Application ined :une 29, 1923.4 seal No. 548,481. I

My. invention relates'to the manufacture of lithopone and particularly to the quenchin of the hot lithopone as it comes from the ca cining furnace ln-which crude lithop'one is heated in the well known process of manufacturing lithopone. The object of my invention is to provide 'a better 'method of quenching the hot lithopone with a special view -to the convenient handling of the '-10 material, the avoidance of the formation of an objectionable .amount l of steam, economy.. inthe use of .quenching water'and the `obtaining 'of a better and more 'uniform mixture .of the .lithopone than has heretofore be'en practicable. The nature of my im roved method, Aand the apparatus which' have devised for practising it, will be best understood as describedv in vconnection Vwith the drawings .which illustrate an apparatus designed forA -use in accordance with my method and in which v 1 Figure 1 is a plan view showing a number of calcining furnaces` and provisions for vqu'enchin and mixing the lithopone` in l accordance with my inventiomand f Figure -2 is a sectional 'elevation on line 2--2 of Fig. 1.

A, A,"etc. are furnaces for heating-the munies. B, B, etc.` represent rotary tube muiies of the general `character described in v my co-pendin application for Letters. Patent led pril 14, 1923, Serial No. 632,045.- To the tubes B which extend through openings A `A2, in the furnace are secured extensions B', B2, havin tires or rims C, C', secured Ito them .whic rest on rollers G, G. The extension B 'has also a sprocket wheel- D secured to itqandf the extension B is covered with a non conducting packing F is a restricted\. delivery 'spout at the end of themunie. H' is a.

hopper into which the crude lithopone is-` jchar ed and Afrom'v'vhi'ch the vlithopone. is

fed Into the milflle through conduit H by a screw conveyer I driven through a sprocket I', chain K and 'sprocket J attached -to driving shaft J'. To shaftJ is also attached g 'a spro'cket'J2 connected to rotate the muie E0- through chain' K. and sprocket D.. The Adriving shaft also actuates a rapper indi- ,cated'at 'L and fully described in .'m'y aforesaid application. M

ywith which Iam familiar. v

Ais a launderfor pipethrough which a 'constant How of water is maintained, flow- 55 mg, as shown, from a reservoir `Mlfed by pipe N and through pipe M to tank O. M2, M2, etc. are conduits registeringv with delivery spouts F and opening into ipe M. P and P are thermocouples by whlch the temperature of the furnace 'and mufilecaln be' ascertained. i -Inl operation the mulilezfurnaces vare in continuous operation and deliver'the calcined lithopone in a uniformand in'e stream 65 through the spouts F and' conduits M2 into the launder M. Through-this launder a continuous stream of 4water is maintained of suliicient quantity to 'quenchjthe streams of hotA lithopone entering thel launder with- 70 out the formation of any considerable amount of steam. The lithopo'ne istransported through the launder; tol thesettling tank O andwhere, as in 'they illustration, a

number of calcininglfurnaces aresimultaneously-delivering lit opone into the vlaunder and tank, the product of allthese furnaces is thoroughly mixed togetherin the launder and tank with the result that a better aver- ?.aging up and mixture of the different furbeen practicable byf anyof 'the expedients 85 i used in the treatment of the furnace product Having -now described my invention, what I claim` as new anddesire to s ecurey by Letters' Patent is: v

1. The metho of quenching calcined lithopon'e which consists in feeding the' hotv lithopone in 'acontinuous .fine stream into a running stream oflwater .andcontinuously conveying Ithe quenched lithopone kto a-settling tank by means of said runnin v stream.' 2...The method of' quenching4 an mixing j calcined lithopone produced in two or more calcining furnaces which consists in'simultaneously. feeding the hot lithqrlixc in' con-- 100 tinuous fine streams vfromthe aces into a bod of quenchingwaterf,

'3.' e method f quenchmg'-and mixing c'alcined lithopone'produccd in two or more *calcining furnaces which consistsin simultaneously feeding' the hot-litho one in continuous line 'streams'from the rnaces into a running stream 'of water. v "1 y 10 o usly delivered to it from the furnace or furnaces, and a settling tank at the delivery end of the conduit. y

5. Apparatus .for quenching lithopone comprising in combination two or more continousl'y operating calcining furnaces hav- `15 ing provision for the continuous delivery of hot calcined lithopone, a Water conduit ar. ranged to receive the lithoponel from the furnaces and a settling tank.

A. soNmN KREBS. 

